However, that’s no longer possible on new devices that have a Secure Enclave Processor on board.

Check out the 157 new emoji coming to your iPhone in 2018

The iBoot leak could bring back tethered jailbreaks too, the kind that require the phone to be connected to a computer when booting.

The leak was first posted on Reddit about a year ago, but it went largely unnoticed.

It’s likely that some people noticed the leak and have been working on discovering iOS vulnerabilities for months.

Apple has confirmed the source code is from iOS 9, which was released in 2015.

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A spokesperson told CNET: "Old source code from three years ago appears to have been leaked.

"But by design the security of our products doesn't depend on the secrecy of our source code.

"There are many layers of hardware and software protections built into our products, and we always encourage customers to update to the newest software releases to benefit from the latest protections."